Infiniti G37. LAN System (2013 year). Manual — part 1

LAN

LAN-1

ELECTRICAL & POWER CONTROL

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SECTION

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CONTENTS

LAN SYSTEM

CAN FUNDAMENTAL

PRECAUTION . . . . . . . . . . . ...

6

PRECAUTIONS . . . . . . . . . . . . ...

6

Precautions for Trouble Diagnosis . . . . . . ....

6

Precautions for Harness Repair . . . . . . . ....

6

SYSTEM DESCRIPTION . . . . . . . ..

7

CAN COMMUNICATION SYSTEM . . . . . .

7

System Description . . . . . . . . . . . . ...

7

System Diagram . . . . . . . . . . . . . ....

7

CAN Communication Control Circuit . . . . . .....

8

DIAG ON CAN . . . . . . . . . . . . . .

9

Description . . . . . . . . . . . . . . . ....

9

System Diagram . . . . . . . . . . . . . ....

9

TROUBLE DIAGNOSIS . . . . . . . . . .

10

Condition of Error Detection . . . . . . . . .

10

Symptom When Error Occurs in CAN Communi-
cation System . . . . . . . . . . . . . . ..

10

CAN Diagnosis with CONSULT . . . . . . . ..

13

Self-Diagnosis . . . . . . . . . . . . . . .

13

CAN Diagnostic Support Monitor . . . . . . .

13

How to Use CAN Communication Signal Chart . ..

15

BASIC INSPECTION . . . . . . . . ...

16

DIAGNOSIS AND REPAIR WORKFLOW . . .

16

Trouble Diagnosis Flow Chart . . . . . . . . .

16

Trouble Diagnosis Procedure . . . . . . . . ..

16

CAN

HOW TO USE THIS MANUAL . . . . . .

21

HOW TO USE THIS SECTION . . . . . . ...

21

Caution . . . . . . . . . . . . . . . . .

21

Abbreviation List . . . . . . . . . . . . . ..

21

PRECAUTION . . . . . . . . . . . ..

22

PRECAUTIONS . . . . . . . . . . . . .

22

Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" . . . . . . . . . . . . . . . . .

22

Precautions for Trouble Diagnosis . . . . . . ..

22

Precautions for Harness Repair . . . . . . . ..

22

BASIC INSPECTION . . . . . . . . ...

24

DIAGNOSIS AND REPAIR WORKFLOW . .

24

Interview Sheet . . . . . . . . . . . . . .

24

SYSTEM DESCRIPTION . . . . . . . .

25

CAN COMMUNICATION SYSTEM . . . . ...

25

CAN System Specification Chart . . . . . . . .

25

CAN Communication Signal Chart . . . . . . ..

25

DTC/CIRCUIT DIAGNOSIS . . . . . . .

30

CAN COMMUNICATION SYSTEM . . . . ...

30

Component Parts Location . . . . . . . . . ..

30

Wiring Diagram - CAN SYSTEM - . . . . . . ...

31

MALFUNCTION AREA CHART . . . . . .

33

Main Line . . . . . . . . . . . . . . . . .

33

Branch Line . . . . . . . . . . . . . . . .

33

Short Circuit . . . . . . . . . . . . . . . .

33

MAIN LINE BETWEEN AV AND DLC CIR-
CUIT . . . . . . . . . . . . . . . . ..

34

Diagnosis Procedure . . . . . . . . . . . ...

34

MAIN LINE BETWEEN DLC AND ABS CIR-
CUIT . . . . . . . . . . . . . . . . ..

36

Diagnosis Procedure . . . . . . . . . . . ...

36

MAIN LINE BETWEEN DLC AND ADP CIR-
CUIT . . . . . . . . . . . . . . . . ..

37

Diagnosis Procedure . . . . . . . . . . . ...

37

2013 G Sedan

LAN-2

MAIN LINE BETWEEN ADP AND ABS CIR-
CUIT . . . . . . . . . . . . . . . . ...

38

Diagnosis Procedure . . . . . . . . . . . ..

38

ECM BRANCH LINE CIRCUIT . . . . . . ..

40

Diagnosis Procedure . . . . . . . . . . . ..

40

4WD BRANCH LINE CIRCUIT . . . . . . ..

41

Diagnosis Procedure . . . . . . . . . . . ..

41

AV BRANCH LINE CIRCUIT . . . . . . . .

42

Diagnosis Procedure . . . . . . . . . . . ..

42

PSB BRANCH LINE CIRCUIT . . . . . . ...

43

Diagnosis Procedure . . . . . . . . . . . ..

43

TCM BRANCH LINE CIRCUIT . . . . . . ..

44

Diagnosis Procedure . . . . . . . . . . . ..

44

A-BAG BRANCH LINE CIRCUIT . . . . . ..

45

Diagnosis Procedure . . . . . . . . . . . ..

45

BCM BRANCH LINE CIRCUIT . . . . . . ..

46

Diagnosis Procedure . . . . . . . . . . . ..

46

DLC BRANCH LINE CIRCUIT . . . . . . ...

47

Diagnosis Procedure . . . . . . . . . . . ..

47

M&A BRANCH LINE CIRCUIT . . . . . . ..

48

Diagnosis Procedure . . . . . . . . . . . ..

48

STRG BRANCH LINE CIRCUIT . . . . . .

49

Diagnosis Procedure . . . . . . . . . . . ..

49

ADP BRANCH LINE CIRCUIT . . . . . . ..

50

Diagnosis Procedure . . . . . . . . . . . ..

50

ABS BRANCH LINE CIRCUIT . . . . . . ..

51

Diagnosis Procedure . . . . . . . . . . . ..

51

ICC BRANCH LINE CIRCUIT . . . . . . .

52

Diagnosis Procedure . . . . . . . . . . . ..

52

IPDM-E BRANCH LINE CIRCUIT . . . . . .

53

Diagnosis Procedure . . . . . . . . . . . ..

53

CAN COMMUNICATION CIRCUIT . . . . .

54

Diagnosis Procedure . . . . . . . . . . . ..

54

CAN SYSTEM (TYPE 1)

DTC/CIRCUIT DIAGNOSIS . . . . . . .

56

MAIN LINE BETWEEN AV AND DLC CIR-
CUIT . . . . . . . . . . . . . . . . ...

56

Diagnosis Procedure . . . . . . . . . . . ..

56

MAIN LINE BETWEEN DLC AND ABS CIR-
CUIT . . . . . . . . . . . . . . . . ...

58

Diagnosis Procedure . . . . . . . . . . . ..

58

ECM BRANCH LINE CIRCUIT . . . . . . ..

59

Diagnosis Procedure . . . . . . . . . . . ..

59

AV BRANCH LINE CIRCUIT . . . . . . . .

60

Diagnosis Procedure . . . . . . . . . . . ...

60

TCM BRANCH LINE CIRCUIT . . . . . . ..

61

Diagnosis Procedure . . . . . . . . . . . ...

61

A-BAG BRANCH LINE CIRCUIT . . . . . ..

62

Diagnosis Procedure . . . . . . . . . . . ...

62

BCM BRANCH LINE CIRCUIT . . . . . . ..

63

Diagnosis Procedure . . . . . . . . . . . ...

63

DLC BRANCH LINE CIRCUIT . . . . . . ..

64

Diagnosis Procedure . . . . . . . . . . . ...

64

M&A BRANCH LINE CIRCUIT . . . . . . ..

65

Diagnosis Procedure . . . . . . . . . . . ...

65

STRG BRANCH LINE CIRCUIT . . . . . .

66

Diagnosis Procedure . . . . . . . . . . . ...

66

ABS BRANCH LINE CIRCUIT . . . . . . ..

67

Diagnosis Procedure . . . . . . . . . . . ...

67

IPDM-E BRANCH LINE CIRCUIT . . . . . .

68

Diagnosis Procedure . . . . . . . . . . . ...

68

CAN COMMUNICATION CIRCUIT . . . . ...

69

Diagnosis Procedure . . . . . . . . . . . ...

69

CAN SYSTEM (TYPE 2)

DTC/CIRCUIT DIAGNOSIS . . . . . .

71

MAIN LINE BETWEEN AV AND DLC CIR-
CUIT . . . . . . . . . . . . . . . . ...

71

Diagnosis Procedure . . . . . . . . . . . ...

71

MAIN LINE BETWEEN DLC AND ADP CIR-
CUIT . . . . . . . . . . . . . . . . ...

73

Diagnosis Procedure . . . . . . . . . . . ...

73

MAIN LINE BETWEEN ADP AND ABS CIR-
CUIT . . . . . . . . . . . . . . . . ...

74

Diagnosis Procedure . . . . . . . . . . . ...

74

ECM BRANCH LINE CIRCUIT . . . . . . ..

76

Diagnosis Procedure . . . . . . . . . . . ...

76

AV BRANCH LINE CIRCUIT . . . . . . . .

77

Diagnosis Procedure . . . . . . . . . . . ...

77

A-BAG BRANCH LINE CIRCUIT . . . . . ..

78

Diagnosis Procedure . . . . . . . . . . . ...

78

BCM BRANCH LINE CIRCUIT . . . . . . ..

79

Diagnosis Procedure . . . . . . . . . . . ...

79

DLC BRANCH LINE CIRCUIT . . . . . . ..

80

Diagnosis Procedure . . . . . . . . . . . ...

80

M&A BRANCH LINE CIRCUIT . . . . . . ..

81

Diagnosis Procedure . . . . . . . . . . . ...

81

2013 G Sedan

LAN

LAN-3

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STRG BRANCH LINE CIRCUIT . . . . . . .

82

Diagnosis Procedure . . . . . . . . . . . ...

82

ADP BRANCH LINE CIRCUIT . . . . . . ...

83

Diagnosis Procedure . . . . . . . . . . . ...

83

ABS BRANCH LINE CIRCUIT . . . . . . ...

84

Diagnosis Procedure . . . . . . . . . . . ...

84

IPDM-E BRANCH LINE CIRCUIT . . . . . ..

85

Diagnosis Procedure . . . . . . . . . . . ...

85

CAN COMMUNICATION CIRCUIT . . . . .

86

Diagnosis Procedure . . . . . . . . . . . ...

86

CAN SYSTEM (TYPE 3)

DTC/CIRCUIT DIAGNOSIS . . . . . . .

88

MAIN LINE BETWEEN AV AND DLC CIR-
CUIT . . . . . . . . . . . . . . . . .

88

Diagnosis Procedure . . . . . . . . . . . ...

88

MAIN LINE BETWEEN DLC AND ABS CIR-
CUIT . . . . . . . . . . . . . . . . .

90

Diagnosis Procedure . . . . . . . . . . . ...

90

ECM BRANCH LINE CIRCUIT . . . . . . ...

91

Diagnosis Procedure . . . . . . . . . . . ...

91

AV BRANCH LINE CIRCUIT . . . . . . . ..

92

Diagnosis Procedure . . . . . . . . . . . ...

92

TCM BRANCH LINE CIRCUIT . . . . . . ...

93

Diagnosis Procedure . . . . . . . . . . . ...

93

A-BAG BRANCH LINE CIRCUIT . . . . . ...

94

Diagnosis Procedure . . . . . . . . . . . ...

94

BCM BRANCH LINE CIRCUIT . . . . . . ..

95

Diagnosis Procedure . . . . . . . . . . . ...

95

DLC BRANCH LINE CIRCUIT . . . . . . ...

96

Diagnosis Procedure . . . . . . . . . . . ...

96

M&A BRANCH LINE CIRCUIT . . . . . . ..

97

Diagnosis Procedure . . . . . . . . . . . ...

97

STRG BRANCH LINE CIRCUIT . . . . . . .

98

Diagnosis Procedure . . . . . . . . . . . ...

98

ABS BRANCH LINE CIRCUIT . . . . . . ...

99

Diagnosis Procedure . . . . . . . . . . . ...

99

IPDM-E BRANCH LINE CIRCUIT . . . . .

100

Diagnosis Procedure . . . . . . . . . . . .

100

CAN COMMUNICATION CIRCUIT . . . . ..

101

Diagnosis Procedure . . . . . . . . . . . .

101

CAN SYSTEM (TYPE 4)

DTC/CIRCUIT DIAGNOSIS . . . . . ...

103

MAIN LINE BETWEEN AV AND DLC CIR-
CUIT . . . . . . . . . . . . . . . .

103

Diagnosis Procedure . . . . . . . . . . . .

103

MAIN LINE BETWEEN DLC AND ADP CIR-
CUIT . . . . . . . . . . . . . . . .

105

Diagnosis Procedure . . . . . . . . . . . .

105

MAIN LINE BETWEEN ADP AND ABS CIR-
CUIT . . . . . . . . . . . . . . . .

106

Diagnosis Procedure . . . . . . . . . . . .

106

ECM BRANCH LINE CIRCUIT . . . . . ...

108

Diagnosis Procedure . . . . . . . . . . . .

108

AV BRANCH LINE CIRCUIT . . . . . . ..

109

Diagnosis Procedure . . . . . . . . . . . .

109

TCM BRANCH LINE CIRCUIT . . . . . .

110

Diagnosis Procedure . . . . . . . . . . . .

110

A-BAG BRANCH LINE CIRCUIT . . . . .

111

Diagnosis Procedure . . . . . . . . . . . .

111

BCM BRANCH LINE CIRCUIT . . . . . ...

112

Diagnosis Procedure . . . . . . . . . . . .

112

DLC BRANCH LINE CIRCUIT . . . . . .

113

Diagnosis Procedure . . . . . . . . . . . .

113

M&A BRANCH LINE CIRCUIT . . . . . ...

114

Diagnosis Procedure . . . . . . . . . . . .

114

STRG BRANCH LINE CIRCUIT . . . . . .

115

Diagnosis Procedure . . . . . . . . . . . .

115

ADP BRANCH LINE CIRCUIT . . . . . .

116

Diagnosis Procedure . . . . . . . . . . . .

116

ABS BRANCH LINE CIRCUIT . . . . . .

117

Diagnosis Procedure . . . . . . . . . . . .

117

IPDM-E BRANCH LINE CIRCUIT . . . . ...

118

Diagnosis Procedure . . . . . . . . . . . .

118

CAN COMMUNICATION CIRCUIT . . . . .

119

Diagnosis Procedure . . . . . . . . . . . .

119

CAN SYSTEM (TYPE 5)

DTC/CIRCUIT DIAGNOSIS . . . . . ...

121

MAIN LINE BETWEEN AV AND DLC CIR-
CUIT . . . . . . . . . . . . . . . .

121

Diagnosis Procedure . . . . . . . . . . . .

121

MAIN LINE BETWEEN DLC AND ADP CIR-
CUIT . . . . . . . . . . . . . . . .

123

Diagnosis Procedure . . . . . . . . . . . .

123

MAIN LINE BETWEEN ADP AND ABS CIR-
CUIT . . . . . . . . . . . . . . . .

124

Diagnosis Procedure . . . . . . . . . . . .

124

2013 G Sedan

LAN-4

ECM BRANCH LINE CIRCUIT . . . . . .

126

Diagnosis Procedure . . . . . . . . . . . .

126

AV BRANCH LINE CIRCUIT . . . . . . ...

127

Diagnosis Procedure . . . . . . . . . . . .

127

PSB BRANCH LINE CIRCUIT . . . . . . .

128

Diagnosis Procedure . . . . . . . . . . . .

128

TCM BRANCH LINE CIRCUIT . . . . . .

129

Diagnosis Procedure . . . . . . . . . . . .

129

A-BAG BRANCH LINE CIRCUIT . . . . .

130

Diagnosis Procedure . . . . . . . . . . . .

130

BCM BRANCH LINE CIRCUIT . . . . . .

131

Diagnosis Procedure . . . . . . . . . . . .

131

DLC BRANCH LINE CIRCUIT . . . . . . .

132

Diagnosis Procedure . . . . . . . . . . . .

132

M&A BRANCH LINE CIRCUIT . . . . . .

133

Diagnosis Procedure . . . . . . . . . . . .

133

STRG BRANCH LINE CIRCUIT . . . . . ..

134

Diagnosis Procedure . . . . . . . . . . . .

134

ADP BRANCH LINE CIRCUIT . . . . . .

135

Diagnosis Procedure . . . . . . . . . . . .

135

ABS BRANCH LINE CIRCUIT . . . . . .

136

Diagnosis Procedure . . . . . . . . . . . .

136

ICC BRANCH LINE CIRCUIT . . . . . . ..

137

Diagnosis Procedure . . . . . . . . . . . .

137

IPDM-E BRANCH LINE CIRCUIT . . . . ...

138

Diagnosis Procedure . . . . . . . . . . . .

138

CAN COMMUNICATION CIRCUIT . . . . ..

139

Diagnosis Procedure . . . . . . . . . . . .

139

CAN SYSTEM (TYPE 6)

DTC/CIRCUIT DIAGNOSIS . . . . . .

141

MAIN LINE BETWEEN AV AND DLC CIR-
CUIT . . . . . . . . . . . . . . . . .

141

Diagnosis Procedure . . . . . . . . . . . .

141

MAIN LINE BETWEEN DLC AND ABS CIR-
CUIT . . . . . . . . . . . . . . . . .

143

Diagnosis Procedure . . . . . . . . . . . .

143

ECM BRANCH LINE CIRCUIT . . . . . .

144

Diagnosis Procedure . . . . . . . . . . . .

144

4WD BRANCH LINE CIRCUIT . . . . . .

145

Diagnosis Procedure . . . . . . . . . . . .

145

AV BRANCH LINE CIRCUIT . . . . . . ...

146

Diagnosis Procedure . . . . . . . . . . . .

146

TCM BRANCH LINE CIRCUIT . . . . . .

147

Diagnosis Procedure . . . . . . . . . . . .

147

A-BAG BRANCH LINE CIRCUIT . . . . . .

148

Diagnosis Procedure . . . . . . . . . . . .

148

BCM BRANCH LINE CIRCUIT . . . . . . .

149

Diagnosis Procedure . . . . . . . . . . . .

149

DLC BRANCH LINE CIRCUIT . . . . . . .

150

Diagnosis Procedure . . . . . . . . . . . .

150

M&A BRANCH LINE CIRCUIT . . . . . . .

151

Diagnosis Procedure . . . . . . . . . . . .

151

STRG BRANCH LINE CIRCUIT . . . . . ...

152

Diagnosis Procedure . . . . . . . . . . . .

152

ABS BRANCH LINE CIRCUIT . . . . . . .

153

Diagnosis Procedure . . . . . . . . . . . .

153

IPDM-E BRANCH LINE CIRCUIT . . . . .

154

Diagnosis Procedure . . . . . . . . . . . .

154

CAN COMMUNICATION CIRCUIT . . . . ..

155

Diagnosis Procedure . . . . . . . . . . . .

155

CAN SYSTEM (TYPE 7)

DTC/CIRCUIT DIAGNOSIS . . . . . ...

157

MAIN LINE BETWEEN AV AND DLC CIR-
CUIT . . . . . . . . . . . . . . . . ..

157

Diagnosis Procedure . . . . . . . . . . . .

157

MAIN LINE BETWEEN DLC AND ADP CIR-
CUIT . . . . . . . . . . . . . . . . ..

159

Diagnosis Procedure . . . . . . . . . . . .

159

MAIN LINE BETWEEN ADP AND ABS CIR-
CUIT . . . . . . . . . . . . . . . . ..

160

Diagnosis Procedure . . . . . . . . . . . .

160

ECM BRANCH LINE CIRCUIT . . . . . . .

162

Diagnosis Procedure . . . . . . . . . . . .

162

4WD BRANCH LINE CIRCUIT . . . . . . .

163

Diagnosis Procedure . . . . . . . . . . . .

163

AV BRANCH LINE CIRCUIT . . . . . . .

164

Diagnosis Procedure . . . . . . . . . . . .

164

TCM BRANCH LINE CIRCUIT . . . . . . .

165

Diagnosis Procedure . . . . . . . . . . . .

165

A-BAG BRANCH LINE CIRCUIT . . . . . .

166

Diagnosis Procedure . . . . . . . . . . . .

166

BCM BRANCH LINE CIRCUIT . . . . . . .

167

Diagnosis Procedure . . . . . . . . . . . .

167

DLC BRANCH LINE CIRCUIT . . . . . . .

168

Diagnosis Procedure . . . . . . . . . . . .

168

M&A BRANCH LINE CIRCUIT . . . . . . .

169

2013 G Sedan

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LAN-5

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Diagnosis Procedure . . . . . . . . . . . .

169

STRG BRANCH LINE CIRCUIT . . . . . ...

170

Diagnosis Procedure . . . . . . . . . . . .

170

ADP BRANCH LINE CIRCUIT . . . . . . .

171

Diagnosis Procedure . . . . . . . . . . . .

171

ABS BRANCH LINE CIRCUIT . . . . . . .

172

Diagnosis Procedure . . . . . . . . . . . .

172

IPDM-E BRANCH LINE CIRCUIT . . . . .

173

Diagnosis Procedure . . . . . . . . . . . .

173

CAN COMMUNICATION CIRCUIT . . . . ..

174

Diagnosis Procedure . . . . . . . . . . . .

174

CAN SYSTEM (TYPE 8)

DTC/CIRCUIT DIAGNOSIS . . . . . ...

176

MAIN LINE BETWEEN AV AND DLC CIR-
CUIT . . . . . . . . . . . . . . . . ..

176

Diagnosis Procedure . . . . . . . . . . . .

176

MAIN LINE BETWEEN DLC AND ADP CIR-
CUIT . . . . . . . . . . . . . . . . ..

178

Diagnosis Procedure . . . . . . . . . . . .

178

MAIN LINE BETWEEN ADP AND ABS CIR-
CUIT . . . . . . . . . . . . . . . . ..

179

Diagnosis Procedure . . . . . . . . . . . .

179

ECM BRANCH LINE CIRCUIT . . . . . . .

181

Diagnosis Procedure . . . . . . . . . . . .

181

4WD BRANCH LINE CIRCUIT . . . . . . .

182

Diagnosis Procedure . . . . . . . . . . . .

182

AV BRANCH LINE CIRCUIT . . . . . . ..

183

Diagnosis Procedure . . . . . . . . . . . .

183

PSB BRANCH LINE CIRCUIT . . . . . .

184

Diagnosis Procedure . . . . . . . . . . . .

184

TCM BRANCH LINE CIRCUIT . . . . . .

185

Diagnosis Procedure . . . . . . . . . . . .

185

A-BAG BRANCH LINE CIRCUIT . . . . .

186

Diagnosis Procedure . . . . . . . . . . . .

186

BCM BRANCH LINE CIRCUIT . . . . . ...

187

Diagnosis Procedure . . . . . . . . . . . .

187

DLC BRANCH LINE CIRCUIT . . . . . .

188

Diagnosis Procedure . . . . . . . . . . . .

188

M&A BRANCH LINE CIRCUIT . . . . . ...

189

Diagnosis Procedure . . . . . . . . . . . .

189

STRG BRANCH LINE CIRCUIT . . . . . .

190

Diagnosis Procedure . . . . . . . . . . . .

190

ADP BRANCH LINE CIRCUIT . . . . . .

191

Diagnosis Procedure . . . . . . . . . . . .

191

ABS BRANCH LINE CIRCUIT . . . . . .

192

Diagnosis Procedure . . . . . . . . . . . .

192

ICC BRANCH LINE CIRCUIT . . . . . . .

193

Diagnosis Procedure . . . . . . . . . . . .

193

IPDM-E BRANCH LINE CIRCUIT . . . . ...

194

Diagnosis Procedure . . . . . . . . . . . .

194

CAN COMMUNICATION CIRCUIT . . . . .

195

Diagnosis Procedure . . . . . . . . . . . .

195

2013 G Sedan

LAN-6

< PRECAUTION >

[CAN FUNDAMENTAL]

PRECAUTIONS

PRECAUTION

PRECAUTIONS

Precautions for Trouble Diagnosis

INFOID:0000000008296863

CAUTION:

• Never apply 7.0 V or more to the measurement terminal.
• Use a tester with open terminal voltage of 7.0 V or less.
• Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when

checking the harness.

Precautions for Harness Repair

INFOID:0000000008296864

• Solder the repaired area and wrap tape around the soldered area.

NOTE:
A fray of twisted lines must be within 110 mm (4.33 in).

• Bypass connection is never allowed at the repaired area.

NOTE:
Bypass connection may cause CAN communication error. The
spliced wire becomes separated and the characteristics of twisted
line are lost.

• Replace the applicable harness as an assembly if error is detected on the shield lines of CAN communica-

tion line.

SKIB8766E

SKIB8767E

2013 G Sedan

LAN

CAN COMMUNICATION SYSTEM

LAN-7

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

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SYSTEM DESCRIPTION

CAN COMMUNICATION SYSTEM

System Description

INFOID:0000000008296865

• CAN communication is a multiplex communication system. This enables the system to transmit and receive

large quantities of data at high speed by connecting control units with two communication lines (CAN-H and
CAN-L).

• Control units on the CAN network transmit signals using the CAN communication control circuit. They

receive only necessary signals from other control units to operate various functions.

• CAN communication lines adopt twisted-pair line style (two lines twisted) for noise immunity.

System Diagram

INFOID:0000000008296866

Each control unit passes an electric current to the termination circuits when transmitting CAN communication
signal. The termination circuits produce an electrical potential difference between CAN-H and CAN-L. CAN
communication system transmits and receives CAN communication signals by the potential difference.

SKIB8887E

Component

Description

Main line

CAN communication line between splices

Branch line

CAN communication line between splice and a control unit

Splice

A point connecting a branch line with a main line

Termination circuit

Refer to

LAN-8, "CAN Communication Control Circuit"

.

2013 G Sedan

LAN-8

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

CAN COMMUNICATION SYSTEM

CAN Communication Control Circuit

INFOID:0000000008296867

*: These are the only control units wired with both ends of CAN communication system.

SKIB8713E

Component

System description

CAN controller

It controls CAN communication signal transmission and reception, error detection, etc.

Transceiver IC

It converts digital signal into CAN communication signal, and CAN communication signal into digital
signal.

Noise filter

It eliminates noise of CAN communication signal.

Termination circuit

*

(Resistance of approx. 120

Ω

)

It produces potential difference.

2013 G Sedan

LAN

DIAG ON CAN

LAN-9

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

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DIAG ON CAN

Description

INFOID:0000000008296868

“Diag on CAN” is a diagnosis using CAN communication instead of previous DDL1 and DDL2 communication
lines, between control units and diagnosis unit.

System Diagram

INFOID:0000000008296869

SKIB8714E

Name

Harness

Description

DDL1

Tx
Rx

It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)

DDL2

K-LINE

It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)

Diag on CAN

CAN-H
CAN-L

It is used for trouble diagnosis and control.

2013 G Sedan

LAN-10

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

TROUBLE DIAGNOSIS

TROUBLE DIAGNOSIS

Condition of Error Detection

INFOID:0000000008296870

DTC (e.g. U1000 and U1001) of CAN communication is indicated on SELF-DIAG RESULTS on CONSULT if a
CAN communication signal is not transmitted or received between units for 2 seconds or more.

CAN COMMUNICATION SYSTEM ERROR

• CAN communication line open (CAN-H, CAN-L, or both)
• CAN communication line short (ground, between CAN communication lines, other harnesses)
• Error of CAN communication control circuit of the unit connected to CAN communication line

WHEN DTC OF CAN COMMUNICATION IS INDICATED EVEN THOUGH CAN COMMUNICATION
SYSTEM IS NORMAL

• Removal/installation of parts: Error may be detected when removing and installing CAN communication unit

and related parts while turning the ignition switch ON. (A DTC except for CAN communication may be
detected.)

• Fuse blown out (removed): CAN communication of the unit may cease.
• Voltage drop: Error may be detected if voltage drops due to discharged battery when turning the ignition

switch ON (Depending on the control unit which carries out CAN communication).

• Error may be detected if the power supply circuit of the control unit, which carries out CAN communication,

malfunctions (Depending on the control unit which carries out CAN communication).

• Error may be detected if reprogramming is not completed normally.

CAUTION:

CAN communication system is normal if DTC of CAN communication is indicated on SELF-DIAG
RESULTS of CONSULT under the above conditions. Erase the memory of the self-diagnosis of each
unit.

Symptom When Error Occurs in CAN Communication System

INFOID:0000000008296871

In CAN communication system, multiple units mutually transmit and receive signals. Each unit cannot transmit
and receive signals if any error occurs on CAN communication line. Under this condition, multiple control units
related to the root cause malfunction or go into fail-safe mode.

ERROR EXAMPLE

NOTE:
• Each vehicle differs in symptom of each unit under fail-safe mode and CAN communication line wiring.
• Refer to

LAN-21, "Abbreviation List"

for the unit abbreviation.

Example: TCM branch line open circuit

SKIB8738E

Unit name

Symptom

ECM

Engine torque limiting is affected, and shift harshness increases.

BCM

Reverse warning chime does not sound.

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TROUBLE DIAGNOSIS

LAN-11

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

Example: Data link connector branch line open circuit

NOTE:
• When data link connector branch line is open, transmission and reception of CAN communication signals

are not affected. Therefore, no symptoms occur. However, be sure to repair malfunctioning circuit.

• The model (all units on CAN communication system are Diag on CAN) cannot perform CAN diagnosis with

CONSULT if the following error occurs. The error is judged by the symptom.

EPS control unit

Normal operation.

Combination meter

• Shift position indicator and OD OFF indicator turn OFF.
• Warning lamps turn ON.

ABS actuator and electric unit (control unit)

Normal operation.

TCM

No impact on operation.

IPDM E/R

Normal operation.

Unit name

Symptom

SKIB8739E

Unit name

Symptom

ECM

Normal operation.

BCM

EPS control unit

Combination meter

ABS actuator and electric unit (control unit)

TCM

IPDM E/R

Error

Difference of symptom

Data link connector branch line open circuit

Normal operation.

CAN-H, CAN-L harness short-circuit

Most of the units which are connected to the CAN communication
system enter fail-safe mode or are deactivated.

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< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

TROUBLE DIAGNOSIS

Example: Main Line Between Data Link Connector and ABS Actuator and Electric Unit (Control Unit) Open Circuit

Example: CAN-H, CAN-L Harness Short Circuit

SKIB8740E

Unit name

Symptom

ECM

Engine torque limiting is affected, and shift harshness increases.

BCM

• Reverse warning chime does not sound.
• The front wiper moves under continuous operation mode even though the front wip-

er switch being in the intermittent position.

EPS control unit

The steering effort increases.

Combination meter

• The shift position indicator and OD OFF indicator turn OFF.
• The speedometer is inoperative.
• The odo/trip meter stops.

ABS actuator and electric unit (control unit)

Normal operation.

TCM

No impact on operation.

IPDM E/R

When the ignition switch is ON,
• The headlamps (Lo) turn ON.
• The cooling fan continues to rotate.

SKIB8741E

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TROUBLE DIAGNOSIS

LAN-13

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

CAN Diagnosis with CONSULT

INFOID:0000000008296872

CAN diagnosis on CONSULT extracts the root cause by receiving the following information.
• Response to the system call
• Control unit diagnosis information
• Self-diagnosis
• CAN diagnostic support monitor

Self-Diagnosis

INFOID:0000000008296873

If communication signals cannot be transmitted or received among units communicating via CAN communica-
tion line, CAN communication-related DTC is displayed on the CONSULT “Self Diagnostic Result” screen.
NOTE:
The following table shows examples of CAN communication-related DTC. For other DTC, refer to the applica-
ble sections.

CAN Diagnostic Support Monitor

INFOID:0000000008296874

MONITOR ITEM (CONSULT)

Unit name

Symptom

ECM

• Engine torque limiting is affected, and shift harshness increases.
• Engine speed drops.

BCM

• Reverse warning chime does not sound.
• The front wiper moves under continuous operation mode even though the front

wiper switch being in the intermittent position.

• The room lamp does not turn ON.
• The engine does not start (if an error or malfunction occurs while turning the igni-

tion switch OFF.)

• The steering lock does not release (if an error or malfunction occurs while turning

the ignition switch OFF.)

EPS control unit

The steering effort increases.

Combination meter

• The tachometer and the speedometer do not move.
• Warning lamps turn ON.
• Indicator lamps do not turn ON.

ABS actuator and electric unit (control unit)

Normal operation.

TCM

No impact on operation.

IPDM E/R

When the ignition switch is ON,
• The headlamps (Lo) turn ON.
• The cooling fan continues to rotate.

DTC

Self-diagnosis item

(CONSULT indication)

DTC detection condition

Inspection/Action

U1000

CAN COMM CIRCUIT

ECM

When ECM is not transmitting or receiving CAN
communication signal of OBD (emission-relat-
ed diagnosis) for 2 seconds or more.

Start the inspection. Re-
fer to the applicable sec-
tion of the indicated
control unit.

Except
for ECM

When a control unit (except for ECM) is not
transmitting or receiving CAN communication
signal for 2 seconds or more.

U1001

CAN COMM CIRCUIT

When ECM is not transmitting or receiving CAN communi-
cation signal other than OBD (emission-related diagnosis)
for 2 seconds or more.

U1002

SYSTEM COMM

When a control unit is not transmitting or receiving CAN
communication signal for 2 seconds or less.

U1010

CONTROL UNIT(CAN)

When an error is detected during the initial diagnosis for
CAN controller of each control unit.

Replace the control unit
indicating “U1010”.

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< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

TROUBLE DIAGNOSIS

Example: CAN DIAG SUPPORT MNTR indication

Without PAST

With PAST

MONITOR ITEM (ON-BOARD DIAGNOSIS)

NOTE:
For some models, CAN communication diagnosis result is received from the vehicle monitor.

JSMIA0964GB

Item

PRESENT

Description

Initial diagnosis

OK

Normal at present

NG

Control unit error (Except for some control units)

Transmission diagnosis

OK

Normal at present

UNKWN

Unable to transmit signals for 2 seconds or more.

Diagnosis not performed

Control unit name

(Reception diagnosis)

OK

Normal at present

UNKWN

Unable to receive signals for 2 seconds or more.

Diagnosis not performed

No control unit for receiving signals. (No applicable optional parts)

Item

PRESENT

PAST

Description

Transmission diagnosis

OK

OK

Normal at present and in the past

1 – 39

Normal at present, but unable to transmit signals for 2 seconds or more
in the past. (The number indicates the number of ignition switch cycles
from OFF to ON.)

UNKWN

0

Unable to transmit signals for 2 seconds or more at present.

Control unit name

(Reception diagnosis)

OK

OK

Normal at present and in the past

1 – 39

Normal at present, but unable to receive signals for 2 seconds or more
in the past. (The number indicates the number of ignition switch cycles
from OFF to ON.)

UNKWN

0

Unable to receive signals for 2 seconds or more at present.

Not diagnosed

–

Diagnosis not performed.

No control unit for receiving signals. (No applicable optional parts)

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TROUBLE DIAGNOSIS

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< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

C

D

E

F

G

H

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K

L

B

A

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N

Example: Vehicle Display

How to Use CAN Communication Signal Chart

INFOID:0000000008296875

The CAN communication signal chart lists the signals needed for trouble diagnosis. It is useful for detecting
the root cause by finding a signal related to the symptom, and by checking transmission and reception unit.

Item

Result indi-

cated

Error counter

Description

CAN_COMM

(Initial diagnosis)

OK

0

Normal at present

NG

1 – 50

Control unit error
(The number indicates how many times diagnosis has been
run.)

CAN_CIRC_1

(Transmission diagnosis)

OK

0

Normal at present

UNKWN

1 – 50

Unable to transmit for 2 seconds or more at present.
(The number indicates how many times diagnosis has been
run.)

CAN_CIRC_2 – 9

(Reception diagnosis of each unit)

OK

0

Normal at present

UNKWN

1 – 50

Unable to transmit for 2 seconds or more at present.
(The number indicates how many times diagnosis has been
run.)

Diagnosis not performed.

No control unit for receiving signals. (No applicable optional
parts)

SKIB8715E

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LAN-16

< BASIC INSPECTION >

[CAN FUNDAMENTAL]

DIAGNOSIS AND REPAIR WORKFLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Trouble Diagnosis Flow Chart

INFOID:0000000008296876

Trouble Diagnosis Procedure

INFOID:0000000008296877

INTERVIEW WITH CUSTOMER

Interview with the customer is important to detect the root cause of CAN communication system errors and to
understand vehicle condition and symptoms for proper trouble diagnosis.

Points in interview

• What: Parts name, system name
• When: Date, Frequency
• Where: Road condition, Place
• In what condition: Driving condition/environment
• Result: Symptom
NOTE:
• Check normal units as well as error symptoms.
- Example: Circuit between ECM and the combination meter is judged normal if the customer indicates

tachometer functions normally.

• When a CAN communication system error is present, multiple control units may malfunction or go into fail-

safe mode.

JSMIA0528GB

2013 G Sedan